控件状态改变js代码
var a=_g().getWidgetByName("状态控件名").getValue(); 
if(a=="按货品"){_g().getWidgetByName("渠道控件名").setEnable(false);}
else{_g().getWidgetByName("渠道控件名").setEnable(true);}
或者
var a=this.options.form.getWidgetByName("状态控件名").getValue(); 
if(a=="按货品"){this.options.form.getWidgetByName("渠道控件名").setEnable(false);}
else{this.options.form.getWidgetByName("渠道控件名").setEnable(true);}

参照修改：

var form = this.options.form;

var value = this.getValue();

if(value == "twoweek"){

form.invisible(["L年月1","L年月2","month1","month2","L开始日期","L结束日期","start_date","end_date"]);

form.visible(["L上双周开始日期","L上双周结束日期","L本双周开始日期","L本双周结束日期","start_date_sz","end_date_sz","start_date_bz","end_date_bz"]);

}